Collison, R. L. (1964). Encyclopaedias: Their history throughout the ages : a bibliographical guide with extensive historical notes to the general encyclopaedias issued throughout the world from 350 B.C. to the present day. New York: Hafner Pub. Co..
Παραπομπή Chicago StyleCollison, Robert Lewis. Encyclopaedias: Their History Throughout the Ages : A Bibliographical Guide With Extensive Historical Notes to the General Encyclopaedias Issued Throughout the World From 350 B.C. to the Present Day. New York: Hafner Pub. Co., 1964.
Παραπομπή MLACollison, Robert Lewis. Encyclopaedias: Their History Throughout the Ages : A Bibliographical Guide With Extensive Historical Notes to the General Encyclopaedias Issued Throughout the World From 350 B.C. to the Present Day. New York: Hafner Pub. Co., 1964.